This page shows in what ways Howitzer is weak against Gadget. Or in other words what actions should Howitzer do to receive minimal damage from Gadget. Note: any hero isn't always strong or weak against another one. It depends on many different factors so please keep that in mind while adding your tip.
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Try to poke her with Q from afar until you get your ult. Her lack of reliables escapes makes her especially vunerable to your All-in but she can quickly bring you down if she lands her abilities.